inputex-ace destructor
wysiwyg: correction w fallback
wysiwyg improve fallback mode

* refactor code
+ improved join method to manage more cases
* slightly less computation
* various corrections
Merge branch 'master' of github.com:Heigvd/Wegas

# By Yannick Lagger
# Via Yannick Lagger
* 'master' of github.com:Heigvd/Wegas:
  PMG add Month / Week + fix tests
  Fix #745 add planification